Reflect for a moment on the fact that the “S” in SMTP stands for “simple,” not “secure.” The e-mail protocol was originally developed for a small number of collegial scientists sending messages about ...
While Windows doesn't give you the ability to create encrypted ZIP files, software like 7Zip does. If you choose the standard ZIP encryption (weak encryption) when making the ZIP file, then Windows ...
Zip encryption is vulnerable to known-plaintext attacks. Implementation quality also is an issue; WinZip's is particularly bad. No source, I'm afraid.
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